Structure and Origin
- The supratrochlear nerve is a terminal branch of the frontal nerve.
- It arises midway between the base and apex of the orbit.
- The supratrochlear nerve passes above the trochlea of the superior oblique muscle.
- It travels anteriorly above the levator palpebrae superioris muscle.
- The nerve exits the orbit through the supraorbital notch or foramen.

Course
- The supratrochlear nerve passes medially above the trochlea of the superior oblique muscle.
- It then travels anteriorly above the levator palpebrae superioris muscle.
- Exiting the orbit through the supraorbital notch or foramen.
- It ascends onto the forehead beneath the corrugator supercilii muscle and frontalis muscle.
- Finally, it divides into sensory branches.

Function
- The supratrochlear nerve provides sensory innervation to the skin and conjunctiva of the upper eyelid.
- It also innervates the skin of the inferomedial forehead.
- The nerve may provide sensory innervation to part of the periosteum of the frontal bone.

Clinical Significance
- The supratrochlear nerve can be anesthetised for surgery of parts of the scalp.
- It is used for small lesions or more extensive injuries to the scalp.
- Often, the nerve is anesthetised alongside the supraorbital artery.

None

Supratrochlear nerve (Wikipedia)

Not to be confused with infratrochlear nerve.

The supratrochlear nerve is a branch of the frontal nerve, itself a branch of the ophthalmic nerve (CN V₁) from the trigeminal nerve (CN V). It provides sensory innervation to the skin of the forehead and the upper eyelid.

Supratrochlear nerve
Sensory areas of the head, showing the general distribution of the three divisions of the fifth nerve. (Supratrochlear nerve labeled at upper left.)
Nerves of the orbit. Seen from above. (Supratrochlear nerve visible near top.)
Details
From	Frontal nerve
Identifiers
Latin	nervus supratrochlearis
TA98	A14.2.01.024
TA2	6203
FMA	52642
Anatomical terms of neuroanatomy [edit on Wikidata]